#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;

  struct ListNode {
      int val;
      ListNode *next;
      ListNode() : val(0), next(nullptr) {}
      ListNode(int x) : val(x), next(nullptr) {}
      ListNode(int x, ListNode *next) : val(x), next(next) {}
  };
 
class Solution {
public:
    ListNode* trainningPlan(ListNode* head)
    {
        ListNode* newhead = NULL;
        ListNode* cur = head;
        while (cur != NULL)
        {
            ListNode* curnext = cur->next;
            cur->next = newhead;
            newhead = cur;
            cur = curnext;
        }
        return newhead;
    }
};